Browsing by Author "Amado, Anabela"
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- Aditamentos à vegetação de Portugal continentalPublication . Aguiar, Carlos; Costa, José C.; Capelo, Jorge; Amado, Anabela; Honrado, João José; Espírito Santo, Dalila; Lousã, Mário
- Aportaciones al conocimiento de la flora y vegetación del centro-occidente ibérico (CW de España y NE de Portugal). Flora and Vegetation of central-western Iberian Peninsula (CW of Spain and NE of Portugal)Publication . Bernardos, Sónia; Amado, Anabela; Aguiar, Carlos; Crespí, António; Castro, Adriano; Amich, FranciscoContinuando con nuestros estudios sobre la Flora y Vegetación en el centro occidente ibérico, y en particular en la Cuenca del Duero (p.e. Amado et al. in Aguiar et al., 2003; Bernardos et al., 2003; Crespí et al., 2003; Bernardos et al., 2004), presentamos ahora diversos resultados de índole corológica, taxonómica y fitosociológica obtenidos en estos territorios lusitano durienses, así como en el sector biogeográfico Toledano Tagano. Aportamos nuevas citas de diversas especies en la zona estudiada, ampliamos asimismo el área de distribución de varios táxones y, por último, discutimos el encuadre sintaxonómico de algunas especies relevantes.
- Conservation status of the threatened Iberian Peninsula narrow endemic Antirrhinum lopesianum Rothm. (Scrophulariaceae)Publication . Bernardos, Sónia; Amado, Anabela; Aguiar, Carlos; Santos, Cledir; Fernández Diez, Javier; Gonzalez-Talavan, A.; Amich, FranciscoAntirrhinum lopesianum Rothm. is a narrow endemic of the Lusitan Duriensean biogeographical sector (central western Spain and north-eastern Portugal). The species is listed as threatened in several Spanish documents, although it does not figure as such in any Portuguese document. This paper provides a detailed study of its distribution, estimates of the sizes of its populations, the threats it faces, and its current conservation status. The total number of individuals thought to exist is only 768, distributed along the valley of the River Duero on the Spanish – Portuguese border (562, 71.2%), and in the Portuguese Sabor River valley (206, 26.8%). The main threat to the species is loss of habitat: about one third of the Iberian populations can be considered threatened; one population containing 37.6% of all these plants (289) is severely threatened. To determine the Area of Occupancy and the Extent of Occurrence, an exhaustive bibliographical survey was carried out, and herbarium specimens deposited in several institutions were revised. It is, therefore, classifiable as Critically Endangered in Portugal and Endangered in Spain
- Helianthemum apenninum (L.) Mill. subsp. apenninum (Cistaceae), um caméfito novo para a flora de PortugalPublication . Aguiar, Carlos; Amado, AnabelaO Helianthemum apeninnum subsp. apenninum é um caméfito sufruticoso acinzentado, de distribuição mediterrânica-europeia. Na Primavera de 2005 detectamos este taxon nos planaltos de Miranda e da Beira Alta, onde, consoante pudemos averiguar entre 2006 e 2009, ocorre com alguma frequência. Curiosamente, não encontramos na bibliografia florística referente a Trás-os-Montes qualquer alusão a este pequeno arbusto, provavelmente porque passa facilmente desapercebido por entre as plantas do abundantíssimo Halimium umbellatum subsp. viscosum. A ecologia H. apeninnum subsp. apenninum nos planaltos de Miranda e da Beira Transmontana parece ser constante. Surge em formações de Celtica (Stipa) gigantea ou em matos pioneiros, fitocenoticamente insaturados, de Halimium umbellatum subsp. viscosum e Lavandula pedunculata s.l., sempre em solos com alguma humidade, geralmente na vizinhança de algum lameiro de secadal (lameiros com vegetação de Stipo-Agrostietea castellanae). Além desta subespécie, em Portugal, concretamente nos arredores de Bragança, surge o H. apenninum subsp. rothmaleri (Rothm.) Mayor & Fdez. Benito, um endemismo luso-orensano-leonês, que se distingue facilmente da subespécie tipo pela sua corola amarela.
- Herbaceous plant diversity across fire created edges in continental holm oak woodlandsPublication . Azevedo, João; Fernández-Núñez, Esther; Miguel, Luis; Amado, Anabela; Possacos, Anabela; Aguiar, CarlosWe analyzed herbaceous plants distribution across edges of holm oak (Quercus rotundifolia) woodlands created and maintained by fire in order to describe plant community structure across edges and to evaluate the role of fire in the patterning of plant diversity at the patch scale. We recorded abundance in twelve 60 m long sampling lines placed perpendicularly to the woodlands boundary at 1, 5, 10, and 20m outside and 0, 1, 5, 10, 20, and 40m inside the woodlands, using the line intercept method (2 x 10 m line parallel to the boundary). In the same locations, we measured tree and shrub cover, height and density and recorded time since last fire disturbance. Data was analysed graphically and statistically using multivariate ordination analysis techniques, namely CCA. Results indicated that, on average, herbaceous species richness was higher outside than inside the woodlands and peaked 1m outside the boundary. Time since last fire in adjacent shrublands affected richness patterns across edges. Richness was higher outside than inside in young adjacent shurblands, higher inside than outside in old shrublands and peaked 1m outside in intermediate age shrublands, interior, exterior and edge (1m outside the boundary) species and locations were well correlated with explanatory variables reflecting the interior exterior woodland gradient sampled and shrub recovery after fire.
- Scrophularia valdesii Ortega Olivencia & Devesa: confirmada a presença em Portugal de mais um endemismo lusitano-duriensePublication . Marcos, N.; Amado, Anabela; Aguiar, CarlosA Scrophularia valdesii é endemismo Ibérico, descrito por A. ORTEGA Olivencia & J.A. Devesa [Candollea 46: 111-118 (pág. 115)], cujo tipo nomencla-tural provém do termo de Aldeadávila, no canhão do Rio Douro Internacional. J.C. Costa et al. (Quercetea 0, 1998) consideram-na como um endemismo lusitano-duriense. O elenco dos endemis-mos, ou quasi endemismos, lusitano-duriense presentes em Portugal é agora constituído pelos seguintes táxones: Anarrhinum duriminium (Brot.) Pers., Antirrhinum lopesianum Rothm., Galium teres Merino (= Galium glaucum L. subsp. australe Franco), Scrophularia valdesii, Isatis platyloba Steud., Linaria coutinhoi Valdés, Trigonella polyceratia L. subsp. amandiana (Samp.) Amich & J. Sánchez, Holcus setiglumis Boiss. & Reut. subsp. duriensis P. Silva e Silene boryi Boiss. subsp. duriensis (Samp.) Coutinho.
- The role of holm oak edges in the control of disturbance and conservation of plant diversity in fire-prone landscapesPublication . Azevedo, João; Possacos, Anabela; Aguiar, Carlos; Amado, Anabela; Miguel, Luis; Dias, Rui; Loureiro, Carlos; Fernandes, Paulo M.Holm oak (Quercus rotundifolia) woodlands have been able to persist in fire-prone landscapes in northern Portugal where they seem to play a relevant role in community and landscape level patterns and processes, namely in the control of disturbance events and in the maintenance of biodiversity. In this research we tested the following hypotheses: (i) holm oak woodlands affect fire behavior, mainly by disrupting and delaying fire spread; (ii) disruption and delaying of fire spread is due to fire extinction at the edge of woodlands; and (iii) plant diversity is favored by frequent low-intensity fires as a result of the control of fire spread by holm oak woodland edges. We sampled herbaceous, shrub and tree structure and herbaceous plant composition across edges of holm oak woodlands with known recent contact with fire. Using BehavePlus we converted structural data into fuel models and simulated fire behavior for the locations sampled along the exterior–interior gradient of the woodlands. Our results indicate that holm oak woodlands play a relevant role in the control of fire spread and in the maintenance of plant diversity. We found differences in simulated maximum rate of fire spread (ROS) and fireline intensity (FLI) between outside and inside woodlands as well as a 100% probability of fire extinction when fuel moisture was >12% and wind speed at 10 m aboveground was <40 km h 1, supporting the self-extinction hypothesis. We found also that richness and abundance of herbaceous plants varied between the interior and exterior of the woodland, with higher values outside the woodland, and that plant composition along the interior–exterior gradient had distinct patterns. These variables and the pattern of plant distribution were also significantly affected by time since last fire event. We conclude that holm oak woodlands affect fire behavior by interrupting fire spread at the edge zone and that fire-created edges affect herbaceous plant species richness, abundance and distribution by maintaining habitat diversity, which increased plant diversity at patch and landscape levels. Based on our results and other evidence, we developed a conceptual model of the dynamics of fire, landscape structure, and plant diversity in fire-prone landscapes where holm oak patches persist.